219 



The species is represented in our collection by an imago from New 

 York State. 



DiCRANOTA Zetterstedt 



I have the larva of one species of this genus, which is described 

 herein. I have used Miall's description of a European species as an 

 index to the pupal characters of the genus, as this stage is unknown 

 to me. 



The characters for the separation of the larvae of this genus from 

 those of Pedicia and Rhaphidolahis are summarized in the synoptic 

 key. 



DiCRANOTA Sp. ? 



Larva (PI. XXXIV, Fig. 7). — Length, 10 mm. Whitish yel- 

 low. Head black. 



Head long and narrow, posterior portion in the form of a compact 

 arcuate capsule, the sutures poorly defined except in middle and on 

 posterior margin (PI. XXXIV, Fig. 9). Antennae long and slender 

 (Fig. 6) ; maxillary palpi about the same length as antennae but much 

 stouter (Fig. 5), the sensory area very distinct; mandibles long and 

 slender, the apical tooth very acute, inner lower margin with 2-3 

 smaller teeth; labium divided centrally, each side with 3 sharp teeth, 

 the median one of each trio smaller than the others. Segments of 

 body well differentiated, clothed with close decumbent pile and with- 

 out distinguishable bristles; 5 pairs of pseudopods on ventral surfaces 

 of apical 6 segments exclusive of the last one, their apices armed with 

 spines; spiracles situated on a pair of short processes at base of the 

 prolonged apical protuberances ; ventral blood-gills short, 4 in number. 



Described from a specimen taken by Dr. S. A. Forbes among 

 weeds and stones in a stream on Bottlers Ranch, Yellowstone National 

 Park, September 14, 189 1. 



DiCRANOTA BiMACULATA Schummel 



Bicranoia iimaculata Schnmmel, Miall, Trans. Ent. Soc. London, 1893, pp. 235— 

 253. Larva and pupa. 



Prof. L. C. Miall published a detailed account of the life history 

 and anatomy of this species in the paper cited above. In general the 

 larva agrees with the one just described, the differences being found 

 in the structure of the head. I have, however, to rely upon Miall's de- 

 scription and figures of the pupa for details of that stage. 



Pupa. — Thoracic respiratory organs elevated, rather stout, their 



